package org.apache.maven.plugin.internal;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.eclipse.aether.RepositoryException;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.collection.DependencyGraphTransformationContext;
import org.eclipse.aether.collection.DependencyGraphTransformer;
import org.eclipse.aether.graph.DefaultDependencyNode;
import org.eclipse.aether.graph.Dependency;
import org.eclipse.aether.graph.DependencyNode;
import org.eclipse.aether.util.artifact.JavaScopes;

/**
 * Injects plexus-utils:1.1 into a plugin's class path if it doesn't already declare a dependency on
 * plexus-utils. This is another legacy bit to provide backward-compat with Maven 2.x.
 * 
 * @author Benjamin Bentmann
 */
class PlexusUtilsInjector implements DependencyGraphTransformer {

  private static final String GID = "org.codehaus.plexus";

  private static final String AID = "plexus-utils";

  private static final String VER = "1.1";

  private static final String EXT = "jar";

  public DependencyNode transformGraph(DependencyNode node, DependencyGraphTransformationContext context)
      throws RepositoryException {
    if (findPlexusUtils(node) == null) {
      Artifact pu = new DefaultArtifact(GID, AID, null, EXT, VER);
      DefaultDependencyNode child = new DefaultDependencyNode(new Dependency(pu, JavaScopes.RUNTIME));
      child.setRepositories(node.getRepositories());
      child.setRequestContext(node.getRequestContext());
      node.getChildren().add(child);
    }

    return node;
  }

  private DependencyNode findPlexusUtils(DependencyNode node) {
    Artifact artifact = node.getDependency().getArtifact();

    if (AID.equals(artifact.getArtifactId()) && GID.equals(artifact.getGroupId()) && EXT.equals(artifact.getExtension())
        && "".equals(artifact.getClassifier())) {
      return node;
    }

    for (DependencyNode child : node.getChildren()) {
      DependencyNode result = findPlexusUtils(child);
      if (result != null) {
        return result;
      }
    }

    return null;
  }

}
